HIIT It Hard: A Guide to High-Intensity Interval Training
Fitness and exercise · 23 pages · Free e-book
An introduction to high-intensity interval training. It explains the body's three energy systems, how to build a base level of fitness and how to start HIIT safely, then moves on to concurrent training, kettlebell swings, Tabata, fartlek, MetCon and cardio acceleration, and designing your own whole-body circuits.
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